Fix some typos, improve some descriptions

_data/contribute.json

@@ -1,21 +1,21 @@
 [{
 	"title": "Fork and code",
 	"icon": "code-fork",
-	"description": "We're happy about every new feature that someone brings to Vocaluxe. So why don't you just start coding?",
-	"url_text": "HowTo build on windows",
+	"description": "Vocaluxe is free and open source software. We're happy about every new feature that someone brings to Vocaluxe. So why don't you just start coding?",
+	"url_text": "How to build on Windows",
 	"url": "https://github.com/Vocaluxe/Vocaluxe/wiki/HowTo:-Build-Vocaluxe-(Windows)"
 },
 {
 	"title": "Translate",
 	"icon": "globe",
-	"description": "Want to help by translating Vocaluxe into you native language? Or want to improve an existing one?",
+	"description": "Want to help by translating Vocaluxe into your native language or by improving an existing translation?",
 	"url_text": "Start here",
 	"url": "https://www.transifex.com/darkice/vocaluxe/"
 },
 {
-	"title": "Find bugs",
+	"title": "Report bugs",
 	"icon": "bug",
-	"description": "Help us to keep Vocaluxe stable. If you find a bug, just open an issue in our GitHub issue tracker.",
+	"description": "Help us keep Vocaluxe stable. If you find a bug, just open an issue in our GitHub issue tracker.",
 	"url_text": "Open an issue",
 	"url": "https://github.com/Vocaluxe/Vocaluxe/issues"
 }]

_data/features.json

@@ -1,7 +1,7 @@
 [{
 	"title": "Multi language support",
 	"image": "translations.png",
-	"description": "Vocaluxe supports many different languages - If your language isn't avaialable just start translating it!"
+	"description": "Vocaluxe supports many different languages - If your language isn't available just start translating it!"
 },
 {
 	"title": "Party modes",

_data/help.json

@@ -1,7 +1,7 @@
 [{
 	"title": "Forum",
 	"icon": "question-circle",
-	"description": "A big german community with a section about Vocaluxe. The devs are acitve there and could help with (nearly) every problem.",
+	"description": "A big german community with a section dedicated to Vocaluxe. The developers are active there and happy to help with any problems related to the game.",
 	"url_text": "Ask your questions!",
 	"url": "http://forum.ultra-star.de"
 },
@@ -9,13 +9,13 @@
 	"title": "Wiki",
 	"icon": "book",
 	"description": "You can find some nice and helpful articles in our GitHub-wiki. Feel free to improve it, if something is missing.",
-	"url_text": "Start some reading...",
+	"url_text": "Start reading...",
 	"url": "https://github.com/Vocaluxe/Vocaluxe/wiki"
 },
 {
 	"title": "Facebook",
 	"icon": "facebook-square",
-	"description": "Follow us on facebook to get all news about Vocaluxe - And if there are questions, just ask!",
+	"description": "Follow us on Facebook to get all news about Vocaluxe - And if there are questions, just ask!",
 	"url_text": "Give us a like!",
 	"url": "https://www.facebook.com/Vocaluxe"
 }]

_data/songs.json

@@ -1,7 +1,7 @@
 [{
 	"title": "Download",
 	"icon": "music",
-	"description": "More than 18.000 songs: From real classics to brand-new.",
+	"description": "Find more than 18.000 songs on USDB, from real classics to the latest hits.",
 	"url_text": "usdb.animux.de",
 	"url": "http://usdb.animux.de"
 },